Improvement in presses



UNITED STATES `PATENT OEErcE.

GEORGE EASTMAN, OF NEWTON, MASSACHUSETTS.

IMPROVEMENT IN PRESSES.

Specification forming part of Letters Patent No. 173,603, dated February 15, 1876; application led December 13, 1875.

, To all whom it may concern:

v-of the press, is of cast-iron, made massive and heavy when the nature of the work so requires, and provided with ways, furnishing guides for directing the movement of the jaw B in its vertical motion thereon when operated by the compound toggle O D E, crank F, and lever G. The base of the frame projects, as shownmat A', and furnishes the supports for the journals of thc shaft H, which is operated by the lever G, and carries the lcrank F.

The entire frame is made at one casting. Adjustments for varying-sized molds or differing thicknesses of work is effected by the wedgelshaped key I and block K held against the top of the frame by the headed rodsc cl and nuts c2 c3. The under surface of the key I, forming the `upper jaw of the press, is rccessed along the sides parallel with and adjacent to the under surface to receivethe heads of the rods c c1. bThe crossbar or top of the frame is cut away on the surface next adjoinj ing the block K tov correspond in slope with the slope of the upper surface of the key, and of a width sufficient to allow the insertion of block K. l

The jaw and key may be made hollow, as shown, and provided with holes for the introduction and escape of water.

The toggle is so constructed that the links C D are vertical at the moment of the greatest pressure, and-retains that position without any strain ou the lever.

The method of operation is as follows: The required thickness of the work is ascertained, and the key adjusted for that thickness by insertion. or withdrawal to lessen or increase the distance between it andthe jaw, as the case may be. If a greater space is needed than that supplied by withdrawing the ykey to its min-imum point of -efficiency, a thinner block may be used, and if necessary the block may be withdrawn. Of course it will readily be seen that the rods holding the wedge are shortened or lengt-hened, as circumstances require.

The strength of the parts composing the toggle motion is so proportioned .to the strength of the housings that some one 'of them will break before sufficient pressure is exerted to injure the housing or frame. The crank F, or link E, or toggle-lever C shouldthus be made; as, for instance, if the press be intended to exert a pressure of ten tons, the breaking strain of some one of these parts should be made very slightly in excess of ten tons, while the strength of the housing should be made much greater, so that the ultimate pressure desired should be within the factor of safety, while the strain on the weakest part should Aalways be approximated to the ultimate strength, and this should be selected as the one most easy to get at, which is generally the crank.

This arrangement of parts gives particular facility for the repairing of the press, and no danger could eXist from the breakage of crank, link, or toggle-lever, as each is secured at one end, and the danger from flying fragments, caused by the over-straining aud rupture of the housing or frame, is averted.

` Having thus fully described my invention, l claim and desire to secure by Letters Patent of the UnitedStates- 1. ln a press, the combination of the bedplate I and housing K, having opposite inclines on their cont-actin g surface lby means of the rods and nuts c e102 c3, substantially and for the purpose described.

2. The combination of the upright housing y A, rising and falling bed B, the lifting-toggle G D, link E, and lever G, when constructed to concentrate a crushing strain upon the crank or link, all arranged and operating together, substantially as and for the purpose described.

GEoEGE EAsTMAN.

Witnesses:

ALDEN WILDEE, F. F. RAYMOND. 

